Engine fan casings encompass the annular containment structures surrounding the forward fan stage of turbofan engines, manufactured from aluminium alloys, titanium, or composite materials including carbon-fibre-reinforced polymer (CFRP) layups processed via resin transfer moulding (RTM) or automated fibre placement (AFP), and must satisfy FAR/CS Part 33 blade-off containment certification requirements through ballistic impact testing and structural analysis.
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